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物流车座椅减振器双向比对人-椅冲击动力学行为的影响

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北京邮电大学学报 2018年第6期41卷 14-19页

作者：赵雷雷于曰伟周长城杨福兴北京邮电大学自动化学院北京100876 山东理工大学交通与车辆工程学院山东淄博255000

为探明减振器双向比对人-椅系统冲击动力学行为的影响规律,基于台架试验将座椅减振器阻尼特性简化为非对称分段线性函数,进而创建了人-椅非线性动力学模型及方程,并通过座椅台架试验验证了其有效性.以典型脉冲输入模拟座椅受到的垂向冲... 详细信息

为探明减振器双向比对人-椅系统冲击动力学行为的影响规律,基于台架试验将座椅减振器阻尼特性简化为非对称分段线性函数,进而创建了人-椅非线性动力学模型及方程,并通过座椅台架试验验证了其有效性.以典型脉冲输入模拟座椅受到的垂向冲击,对不同强度脉冲激励工况、不同减振器双向比情况下的人-椅冲击动力学行为进行数值仿真.结果表明,当座椅减振器双向比大于1时,更有利于衰减驾驶室地板传递到驾乘人员的冲击;而且冲击输入强度越大,座椅减振器双向比大于1时的相对隔振效果越好.

关键词：物流车座椅减振器双向比

Achieving highly-efficient H2S gas sensor by flower-like SnO_(2)–SnO/p.r.us GaN heterojunction

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Chinese physics B 2023年第2期32卷 193-200页

作者：刘增都灵张少辉边昂方君鹏邢晨阳李山汤谨诚郭宇锋唐为华 College of Integrated Circuit Science and Engineering Nanjing University of Posts and TelecommunicationsNanjing 210023China National and Local Joint Engineering Laboratory for rF Integration and Micro-packing Technologies Nanjing University of Posts and TelecommunicationsNanjing 210023China School of Electronic and Information Engineering Jinling Institute of TechnologyNanjing 211169China Institute of Microscale Optoelectronics Shenzhen UniversityShenzhen 518060China Key Laboratory of Luminescence and Optical Information of Ministry of Education Institute of Optoelectronic TechnologyBeijing Jiaotong UniversityBeijing 100044China School of Integrated Circuits Tsinghua UniversityBeijing 100044China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China State Key Laboratory of Information photonics and Optical Communications School of ScienceBeijing University of Posts and TelecommunicationsBeijing 100876China

A flower-like SnO_(2)–SnO/p.r.us Ga N(FSS/pGaN) heterojunction was fabricated for the first time via a facile spraying process, and the whole process also involved hydrothermal prep.r.tion of FSS and electrochemical wet etching of GaN,and SnO_(2)–SnO composites with p–n junctions were loaded onto pGaN {3.rface directly applied to H_(2)S sensor. Meanwhile,the excellent transp.r. capability of heterojunction between FSS and pGaN facilitates electron transfer, that is, a response time as short as 65 s and a release time up to 27 s can be achieved merely at 150℃ under 50 ppm H_(2)S concentration, which has laid a reasonable theoretical and exp.r.mental foundation for the {3.bsequent pGaN-based heterojunction gas *** lowering working temp.r.ture and high sensitivity(23.5 at 200 ppm H2S) are attributed to the structure of pGaN itself and the heterojunction between SnO_(2)–SnO and pGaN. In addition, the as-obtained sensor showed ultra-high test *** simple design strategy of FSS/pGaN-based H_(2)S sensor highlights its potential in various applications.

关键词： gas sensor SnO_(2)–SnO p.r.us GaN heterojunction

基于BErT嵌入BiLSTM-CrF模型的中文专业术语抽取研究

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情报学报 2020年第4期39卷 409-418页

作者：吴俊程垚郝瀚艾力亚尔·艾则孜刘菲雪苏亦坡北京邮电大学经济管理学院北京100876 深圳暴风智能科技有限公司北京100191

专业术语的识别与自动抽取对于提升专业信息检索精度,构建领域知识图谱发挥着重要基础性作用。为进一步提升中文专业术语识别的精确率和召回率,提出一种端到端的不依赖人工特征选择和领域知识,基于谷歌BErT预训练语言模型及中文预训练... 详细信息

专业术语的识别与自动抽取对于提升专业信息检索精度,构建领域知识图谱发挥着重要基础性作用。为进一步提升中文专业术语识别的精确率和召回率,提出一种端到端的不依赖人工特征选择和领域知识,基于谷歌BErT预训练语言模型及中文预训练字嵌入向量,融合BiLSTM和CrF的中文专业术语抽取模型。以自建的1278条深度学习语料数据为实验对象,该模型对术语提取的F1值为92.96%,相对于传统的浅层机器学习模型(如左右熵与互信息算法、word2vec相似词算法等)和BiLSTM-CrF深度神经网络模型的性能有较为显著的提升。本文也给出了模型应用的具体流程,能够为中文专业术语库的构建提供实践指南。

关键词： BErT BiLSTM CrF 专业术语抽取

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二维材料最新研究进展

物理化学学报 2021年第12期37卷 1-151页

作者：常诚陈伟陈也陈永华陈雨丁峰樊春海范红金范战西龚成宫勇吉何其远洪勋胡晟胡伟达黄维黄元季威李德慧李连忠李强林立凌崇益刘鸣华刘楠刘庄 Kian ping Loh 马建民缪峰彭海琳邵明飞宋礼苏邵孙硕谭超良唐智勇王定胜王欢王金兰王欣王欣然 Andrew T.S.Wee 魏钟鸣吴宇恩吴忠帅熊杰熊启华徐伟高尹鹏曾海波曾志远翟天佑张晗张辉张其春张铁锐张翔赵立东赵美廷赵伟杰赵运宣周凯歌周兴周喻朱宏伟张华刘忠范 Institute of Science and Technology Austria Am Campus 13400 KlosterneuburgAustria Dep.r.ment of Chemistry National University of Singapore3 Science Drive 3117543Singapore Dep.r.ment of Chemistry The Chinese University of Hong KongShatinNew TerritoriesHong KongChina Key Laboratory of Flexible Electronics and Institute of Advanced Materials Nanjing Tech UniversityNanjing 211816China School of life Sciences Shanghai UniversityShanghai 200444China Centre for Multidimensional Carbon Materials Institute for Basic ScienceUlsan 44919Korea School of Chemistry and Chemical Engineering Shanghai Jiao Tong UniversityShanghai 200240China School of physical and Mathematical Sciences Nanyang Technological UniversitySingapore 637371Singapore Dep.r.ment of Chemistry City University of Hong KongKowloonHong KongChina Dep.r.ment of Electrical and Computer Engineering and Quantum Technology Center University of MarylandCollege ParkMaryland 20742USA School of Materials Science and Engineering Beihang UniversityBeijing 100191China Dep.r.ment of Materials Science and Engineering City University of Hong KongKowloonHong KongChina Center of Advanced Nanocatalysis(CAN) Hefei National Laboratory for Physical Sciences at the MicroscaleDepartment of Applied ChemistryUniversity of Science and Technology of ChinaHefei 230026China College of Chemistry and Chemical Engineering State Key Laboratory of Physical Chemistry of Solid SurfacesCollaborative Innovation Center of Chemistry for Energy Materials(iChEM)Xiamen UniversityXiamen361005Fujian ProvinceChina State Key Laboratory of Infrared physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200083China Advanced research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing100081China beijing Key Laboratory of Optoelectronic Functional Materials&Micro-Nano Devices Department of PhysicsRenmin University of ChinaBeijing 100872China School of Optical and Electronic Information Wuhan National Laboratory

research on two-dimensional(2D) materials has been explosively increasing in last seventeen years in varying subjects including condensed matter physics, electronic engineering, materials science, and chemistry since the mechanical exfoliation of graphene in 2004. Starting from graphene, 2D materials now have become a big family with numerous members and diverse categories. The unique structural features and physicochemical prop.r.ies of 2D materials make them one class of the most appealing candidates for a wide range of potential applications. In p.r.icular, we have seen some major breakthroughs made in the field of 2D materials in last five years not only in developing novel synthetic methods and exploring new structures/prop.r.ies but also in identifying innovative applications and pushing forward commercialisation. In this review, we provide a critical summary on the recent progress made in the field of 2D materials with a p.r.icular focus on last five years. After a brief backgroundintroduction, we first discuss the major synthetic methods for 2D materials, including the mechanical exfoliation, liquid exfoliation, vap.r.phase deposition, and wet-chemical synthesis as well as phase engineering of 2D materials belonging to the field of phase engineering of nanomaterials(pEN). We then introduce the sup.r.onducting/optical/magnetic prop.r.ies and chirality of 2D materials along with newly emerging magic angle 2D sup.r.attices. Following that, the promising applications of 2D materials in electronics, optoelectronics, catalysis, energy storage, solar cells, biomedicine, sensors, environments, etc. are described sequentially. Thereafter, we present the theoretic calculations and simulations of 2D materials. Finally, after concluding the current progress, we provide some p.r.onal discussions on the existing challenges and future outlooks in this rapidly developing field.

关键词： Two-dimensional materials Transition metal dichalcogenides phase engineering of nanomaterials Electronics Optoelectronics Catalysis Energy storage and conversion

基于量子不经意密钥传输的量子匿名认证密钥交换协议

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电子与信息学报 2020年第2期42卷 341-347页

作者：魏春艳蔡晓秋王天银苏琦秦素娟高飞温巧燕北京邮电大学网络与交换技术国家重点实验室北京100876 洛阳师范学院数学科学学院洛阳471934 鹏程实验室量子计算研究中心深圳518055 密码科学技术国家重点实验室北京100878

鉴于量子密码在密钥分配方面取得的巨大成功,人们也在尝试利用量子性质来设计其他各类密码协议。匿名认证密钥交换就是一类尚缺乏实用化量子实现途径的密码任务。为此,该文提出一个基于量子不经意密钥传输的量子匿名认证密钥交换协议。... 详细信息

鉴于量子密码在密钥分配方面取得的巨大成功,人们也在尝试利用量子性质来设计其他各类密码协议。匿名认证密钥交换就是一类尚缺乏实用化量子实现途径的密码任务。为此,该文提出一个基于量子不经意密钥传输的量子匿名认证密钥交换协议。它在满足用户匿名性和实现用户与服务器双向认证的前提下,为双方建立了一个安全的会话密钥。该协议的安全性基于量子力学原理,可以对抗量子计算的攻击。此外,该协议中服务器的攻击行为要么无法奏效,要么能够与外部窃听区分开(从而被认定为欺骗),因此服务器通常不敢冒着名誉受损的风险来实施欺骗。

关键词：量子保密查询不经意传输量子匿名认证密钥交换